MH-MX28 Wireless Bluetooth Audio Receiver Board Type-C Module BLT 5.1 20M MP3 Lossless Stereo Electronic DIY Kit

Features:1. Newly upgraded Type-C interface;2. Low-power bluetooth design scheme, support the latest bluetooth 5.1 nsmiion, two- stereo lole playback;3. After the module is connected to Bluetooth, it can quickly realize Bluetooth wirele nsmiion, which is very convenient;4. In an open environment, the Bluetooth connection distance can reach 20 meters;5. Widely used in various Bluetooth audio reception, various audio DIY modification, etc.s:No. Pin Description1 5V Power positive 5V2 GND Negative pole of power supply3 VBAT lithium battery positive 3.7-4.2V4 L Left output5 R Right output6 AGND audio ground1. Power supply: It can be directly powered by Type-C 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery (as shown in the figure below). Note that the power supply interfaces of 5V and 3.7V are different, the 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.2. Audio output: the earphone can be directly connected to the 3.5mm audio interface, and can also be connected to the audio input of the power amplifier board (the interface L/R/AGND as shown in the figure can be directly connected).Precautions:1. Signal interference: The Bluetooth is extremely susceptible to interference from high-frequency or strong electroic signals, so try to p it as far away as poible from sending wirele and other devices. And the board can't be close to the metal objects, keep a certain distance.2. If there is a current sound when connected to the power amplifier board, the cause is caused by the interference of the ground wire. It is recommended not to use plug-in wires at the output end of the Bluetooth module. We need welding wires, especially the ground wires, and the wires should not be too long, the shorter the better. , as thick as poible. If the audio ground is at the ground point of the power amplifier board, it needs to be connected to the ground at the audio input end of the power amplifier. This ground point can be soldered at different positions to achieve the lowest current sound. It is recommended that the Bluetooth and the power amplifier board be powered separately, and the Bluetooth ground and the power amplifier ground be isolated.3. Since this product is designed as a bare board, try not to touch the components on the board with your hands, which will easily cause static electricity to kill the chip and cause it to .